having problems getting a clean wheel speed signal. using 1.1.94, with a hall sensor powered by the 5v from the ps2 port. the signal pin is pulled up with a 4.7k R and has protection diode. Also have a 1000hz low pass RC filter on the input to help with noise. As you can see noise only appears under boost. there is a part of the log which shows the speed register correctly up towards 100mph under no boost. Out of ideas to try! it appears to be the only input with noise. any ideas?